A planetary gear arrangement for carrying load including a sun gear configured to rotate about an axis of rotation of the planetary gear and defines an axial direction of the planetary gear, a plurality of planet gears driven by the sun gear, a ring gear engaged with the plurality of planet gears and a plurality of elliptical pins, each having a longitudinal axis and an outside contact surface, wherein the plurality of elliptical pins are arranged in the plurality of planet gears forming a convergent gap and a divergent gap therebetween, and wherein plurality of elliptical pins are configured to conform to elliptically deformed plurality of planet gears when subjected to the load and form an effective area therebetween to bear the load. An elliptical pin for supporting a gear and a gas turbine engine.

A drive apparatus includes a rail, a shaft, and a motion body. At least a part of the rail is curved such that an opening groove of the rail is curved when the rail is seen from a side orthogonal to an axial direction. The shaft includes flexibility. The shaft includes an engagement portion which is formed in a spiral shape at a circumferential surface thereof. The motion body includes a case portion and an engaged portion held by the case portion so as to be movable, the engaged portion extending inside the rail through the opening groove from an outward of the rail, the engaged portion engaged with the engagement portion of the shaft. The engaged portion is movable in a first direction, and includes an orientation fixed relative to the case portion in a second direction which is orthogonal to the first direction.

A reconfigurable machining center includes a base structure extending in a first direction, a movable crossmember movable in the first direction and provided with a machining head, supporting elements on the base structure to enable movement of the movable crossmember along the first direction, a first leadscrew rack, integral with the base structure and having a first helical circular toothed sector, and extending along the entire base structure parallel to the first direction, and a first screw rotatably coupled to the movable crossmember and engaging a corresponding first leadscrew rack, and having a rotation axis parallel to the first direction. The longitudinal extension of the base structure in the first direction is an integer multiple of the pitch of tooth of the leadscrew racks, and the base structure includes coupling elements adapted to couple the base structure to a following and/or preceding adjacent base structure along the first direction.

A drive apparatus includes a rail, a shaft, and a motion body. At least a part of the rail is curved such that an opening groove of the rail is curved when the rail is seen from a side orthogonal to an axial direction. The shaft includes flexibility. The shaft includes an engagement portion which is formed in a spiral shape at a circumferential surface thereof. The motion body includes a case portion and an engaged portion held by the case portion so as to be movable, the engaged portion extending inside the rail through the opening groove from an outward of the rail, the engaged portion engaged with the engagement portion of the shaft. The engaged portion is movable in a first direction, and includes an orientation fixed relative to the case portion in a second direction which is orthogonal to the first direction.

A reconfigurable machining center includes a base structure extending in a first direction, a movable crossmember movable in the first direction and provided with a machining head, supporting elements on the base structure to enable movement of the movable crossmember along the first direction, a first leadscrew rack, integral with the base structure and having a first helical circular toothed sector, and extending along the entire base structure parallel to the first direction, and a first screw rotatably coupled to the movable crossmember and engaging a corresponding first leadscrew rack, and having a rotation axis parallel to the first direction. The longitudinal extension of the base structure in the first direction is an integer multiple of the pitch of tooth of the leadscrew racks, and the base structure includes coupling elements adapted to couple the base structure to a following and/or preceding adjacent base structure along the first direction.

Provided is a screw shaft in a ball screw device. At least a part of the screw shaft includes a cylindrical body which is manufactured by a filament winding method or a sheet winding method, and a spiral member or a partitioned spiral member which is fixed to an outer circumferential surface of the cylindrical body and forms a thread groove.

A refrigerator includes: a cabinet; a drawer door assembly including a front panel door part and a drawer part that defines an accommodation space; a rail that movably configured to connect the drawer door assembly to the cabinet and enable the drawer door assembly to insert into and withdraw from the cabinet; a driving device located at the front panel door part and configured to provide power; and an elevation device located in the drawer part and configured to be coupled to the driving device and elevate a portion of the drawer part relative to the front panel door part. The driving device includes: a motor assembly configured to provide driving force; a screw assembly configured to perform an elevation operation based on the driving force; and a lever that connects the screw assembly to the elevation device and that is configured to rotate based on the elevation operation.

A driving apparatus reduces degradation of driving performance and durability when a driven body is displaced using a lead screw. The lead screw has a lead groove that is formed over first and second members and has first and second surfaces that face to each other in a width direction. The lead screw is rotated by a driving source. A moving member engages with the lead groove, and moves parallel to the lead screw according to rotation of the lead screw. A driven body is displaced between first and second positions according to movement of the moving member. A first energization member energizes the moving member toward the second surface when the moving member passes across a first junction that occurs at a boundary between the first and second members in a stroke where the moving member contacts with a drive surface of the first surface to be moved.

An adjustment drive for a steering column of a motor vehicle may include a threaded spindle having an external thread, engaging with a corresponding internal thread of a spindle nut. A thread tooth of the external thread and a thread groove of the internal thread have corresponding axially sliding thread flanks that are braced against each other. At least one thread flank comprises at least one recessed lubricant uptake.

An adjusting drive for a steering column for a motor vehicle may include a threaded spindle with an external thread that engages in a spindle nut and a drive unit that is coupled to the threaded spindle or the spindle nut such that the threaded spindle and the spindle nut are able to be rotatably driven relative to one another by overcoming a screw resistance. To permit an optimized adjustment over the entire adjusting region, the threaded spindle includes at least one actuator portion and at least one transition portion. The transition portion is configured such that the screw resistance of the spindle nut is lower in the transition portion than in the actuator portion.